save-error.txt

[E 15:04:08.374 NotebookApp] Notebook JSON is invalid: Additional properties are not allowed (u'html' was unexpected)
    
    Failed validating u'additionalProperties' in schema:
        {u'additionalProperties': False,
         u'description': u'Result of executing a code cell.',
         u'properties': {u'data': {u'$ref': u'#/definitions/misc/mimebundle'},
                         u'execution_count': {u'description': u"A result's prompt number.",
                                              u'minimum': 0,
                                              u'type': [u'integer', u'null']},
                         u'metadata': {u'$ref': u'#/definitions/misc/output_metadata'},
                         u'output_type': {u'description': u'Type of cell output.',
                                          u'enum': [u'execute_result']}},
         u'required': [u'output_type',
                       u'data',
                       u'metadata',
                       u'execution_count'],
         u'type': u'object'}
    
    On instance:
        {u'data': {u'text/plain': [u'   one  two\na    1    1\nb    2    2\nc    3    3\nd  NaN    4']},
         u'execution_count': 3,
         u'html': u'<div style="max-height:1000px;max-width:1500px;overflow:auto;">\n<table border="1" class="dataframe">\n  <thead>\n    <tr style="text-align: right;">\n      <th></th>\n      <th>one</th>\n      <th>two</th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>a</th>\n      <td>1</td>\n      <td>1</td>\n    </tr>\n    <tr>\n      <th>b</th>\n      <td>2</td>\n      <td>2</td>\n    </tr>\n    <tr>\n      <th>c</th>\n      <td>3</td>\n      <td>3</td>\n    </tr>\n    <tr>\n      <th>d</th>\n      <td>NaN</td>\n      <td>4</td>\n    </tr>\n  </tbody>\n</table>\n</div>',
         u'metadata': {},
         u'output_type': u'execute_result'}